diff options
Diffstat (limited to 'bfd')
| -rwxr-xr-x | bfd/load.py | 69 | ||||
| -rw-r--r-- | bfd/test/makefile | 4 | ||||
| -rw-r--r-- | bfd/test/test.c | 2 |
3 files changed, 71 insertions, 4 deletions
diff --git a/bfd/load.py b/bfd/load.py index 865fe91..e8de59a 100755 --- a/bfd/load.py +++ b/bfd/load.py @@ -34,6 +34,7 @@ class CLIArgParser(object): parser.add_argument("--objs", action='store_true', help="dump objects", default=False) parser.add_argument("--dynsym", action='store_true', help="dump dynamic symbol table", default=False) parser.add_argument("--dlpath", action='store_true', help="dump dynamic linker path", default=False) + parser.add_argument("--phdynent", action='store_true', help="dump ph PT_DYNAMIC entries", default=False) parser.add_argument("--section", type=str, help="dump a section") self.args = parser.parse_args() if self.args.obj is None: @@ -142,6 +143,39 @@ def get_ph_type(value): elif value == p_type_e.GNU_RELRO: return "GNU_RELRO" else: return None +class ph_dynamic_entry: + def __init__(self, d_tag, d_un): + self.d_tag = d_tag; + self.d_un = d_un + +class PH_DYN_TAG_TYPE: + DT_NULL = 0 + DT_NEEDED = 1 + DT_PLTRELSZ = 2 + DT_PLTGOT = 3 + DT_HASH = 4 + DT_STRTAB = 5 + DT_SYMTAB = 6 + DT_RELA = 7 + DT_RELASZ = 8 + DT_RELAENT = 9 + DT_STRSZ = 10 + DT_SYMENT = 11 + DT_INIT = 12 + DT_FINI = 13 + DT_SONAME = 14 + DT_RPATH = 15 + DT_SYMBOLIC = 16 + DT_REL = 17 + DT_RELSZ = 18 + DT_RELENT = 19 + DT_PLTREL = 20 + DT_DEBUG = 21 + DT_TEXTREL = 22 + DT_JMPREL = 23 + DT_LOPROC = 24 + DT_HIPROC = 25 + class ELF_ST_BIND: STB_LOCAL = 0 STB_GLOBAL = 1 @@ -308,6 +342,7 @@ class ELF(object): self.data_section = [] self.text_section = [] self.dlpath = str() + self.ph_dyn_ent = [] def init(self, size): self.size = size @@ -340,6 +375,7 @@ class ELF(object): offset += 24 self.pop_data_section() self.pop_text_section() + self.get_ph_dyn_entries() def read_ELF_H(self, size): self.elfhdr.ei_mag = self.so.read(4) @@ -430,6 +466,22 @@ class ELF(object): char = strings[index] return ''.join(name) + def get_ph_dyn_entries(self): + for phdr in self.phdr: + if byte2int(phdr.p_type) == p_type_e.PT_DYNAMIC: + self.so.seek(byte2int(phdr.p_offset), 0) + size = byte2int(phdr.p_memsz) + ph_dyn = self.so.read(size) + for i in range(int(size/8)): + d_tag = byte2int(ph_dyn[8*i:8*i + 4]) + d_un = byte2int(ph_dyn[8*i + 4:8*i + 8]) + self.ph_dyn_ent.append(ph_dynamic_entry(d_tag, d_un)) + + def dump_ph_dyn_entries(self): + for ph_dyn_e in self.ph_dyn_ent: + print(Colors.green + "d_tag: " + Colors.blue + repr(ph_dyn_e.d_tag) + Colors.ENDC, end="\t") + print(Colors.green + "d_un: " + Colors.blue + repr(ph_dyn_e.d_un) + Colors.ENDC) + def dump_funcs(self, dump_b): ret_list = [] dummy = [] @@ -745,6 +797,7 @@ class Call_Rewriter(object): for i in self.md.disasm(self.obj_code, 0x1): if i.mnemonic == "call": print("0x%x:\t%s\t%s" %(i.address, i.mnemonic, i.op_str)) + print(i.bytes) class Global_Rewriter(object): def __init__(self): @@ -771,11 +824,23 @@ def main(): elif argparser.args.dlpath: elf.dump_section(".interp") elif argparser.args.section: elf.dump_section(argparser.args.section) elif argparser.args.test: + counter = 0 print(elf.dump_funcs(False)[10]) print(elf.dump_symbol_string(ELF_ST_TYPE.STT_FUNC, False)[10]) - code = elf.dump_funcs(False)[10] - rewriter = Call_Rewriter(code) + for name in elf.dump_symbol_string(ELF_ST_TYPE.STT_FUNC, False): + if name == "glob": + print(counter) + print(elf.dump_funcs(False)[counter]) + print(name) + if name == "quad": + print(counter) + print(elf.dump_funcs(False)[counter]) + print(name) + counter += 1 + obj = elf.dump_funcs(False)[10] + rewriter = Call_Rewriter(obj) rewriter.run() + elif argparser.args.phdynent: elf.dump_ph_dyn_entries() except: signal.signal(signal.SIGINT, SigHandler_SIGINT) variables = globals().copy() diff --git a/bfd/test/makefile b/bfd/test/makefile index 7115100..3512579 100644 --- a/bfd/test/makefile +++ b/bfd/test/makefile @@ -1,7 +1,7 @@ ##################################VARS################################# CC=clang -CC_FLAGS=-fpic +CC_FLAGS=-fpic -O0 LD_FLAGS= -l bfd TARGET=test ##################################RULES################################ @@ -18,7 +18,7 @@ $(TARGET): $(TARGET).o $(CC) $^ $(LD_FLAGS) -o $@ $(TARGET).asm: $(TARGET).o - objdump -d -M intel -S $(TARGET).o > $(TARGET).asm + objdump -r -d -M intel -S $(TARGET).o > $(TARGET).asm $(TARGET).so: $(TARGET).o $(CC) $^ $(LD_FLAGS) -shared -o $@ diff --git a/bfd/test/test.c b/bfd/test/test.c index a62769a..cac61b6 100644 --- a/bfd/test/test.c +++ b/bfd/test/test.c @@ -19,6 +19,8 @@ int myvar2 = 2; int myvar3 = 3; int myvar4 = 4; +int glob(void) {return myvar1+myvar2+myvar3+myvar4;} + int main(int argc, char** argv) { int sum; sum = add2(10, 20); |